JP3097699B2 - Information signal recording / reproducing device using flying head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information signal recording / reproducing apparatus using a flying head for recording / reproducing a data signal or the like on / from a flexible rotating magnetic disk (hereinafter simply referred to as "FD"). (Hereinafter simply referred to as “FDD”).

[0002]

2. Description of the Related Art An example of a flying head used in a conventional FDD will be described with reference to FIG. The flying head 100 shown in FIG. 3A is a perspective view in the case where the FD recording medium surface is located below the flying head, and the flying head 100 shown in FIG. 3B is a case where the FD recording medium surface is located above the flying head 100. It is a perspective view. Here, reference numeral 101 denotes a head slider, 102 denotes an air bearing slider surface (hereinafter, simply referred to as “ABS surface”), 103 denotes a magnetic head, 104
Is a suspension, 105 is a head mounting plate, 106 is a head mounting hole, 107 is a spot welding spot, and 108 is a gimbal. Head mounting hole 106
DD head actuator arm (not shown)
The magnetic recording is performed on the recording medium surface while the magnetic head 103 is levitated on the ABS 102 on the magnetic recording surface of the FD.

[0003]

The flying head 100 of this embodiment is good for floating on a hard disk. However, when the FD is rotated at a high speed, a particular problem is that the magnetic head 103 does not hit the FD. In particular, 3,600 r. p. m. When the FD is rotated at a high speed, the runout of the FD becomes as large as about 150 μm. As described above, since the suspension 104 is a single plate,
If the FD has a large surface deflection, the head slider 101 rolls as indicated by an arrow 109, and the flying head 100 cannot fly stably. As a result, the recording medium surface of the FD is damaged by the magnetic head 103, the life of the FD is shortened, and the reliability of the FDD is lost. Further, since the spacing loss increases, it is not suitable for high-density recording. Therefore, according to the present invention, the runout of the FD, which is the cause of the above-mentioned drawbacks, is eliminated, and the magnetic head 10
It is an object of the present invention to maintain good contact between the No. 3 and the FD, that is, to reduce spacing loss as much as possible.

[0004]

Therefore, the present invention provides a pair of head sliders supported by a pair of parallel leaf springs.
D, the magnetic recording surface is stabilized, and the F of at least one of the pair of head sliders is
A plurality of ABs provided on the surface in contact with D and separated from each other
The magnetic head is mounted substantially at the center between the S surfaces, and the information signal is magnetically recorded in a stable area of the magnetic recording surface or reproduced from the information signal, thereby solving the above-mentioned problem.

[0005]

Therefore, the flying head of the present invention hardly rolls, and a stable area can be formed on the magnetic recording surface with the head slider, so that there is no spacing loss and ultra-high density recording can be performed. In addition, since the leaf spring also plays the role of a fluid stabilizer, it is possible to eliminate the runout of the FD.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view for explaining a configuration of a flying head according to an embodiment of the present invention. FIG.
FIG. B is a cross-sectional side view taken along line X ₁ -X _{2 in} FIG. 1A.
FIG. C is its bottom view and FIG. D is its front view,
FIG. 2 is a sectional view of a main part of an information signal recording / reproducing apparatus using the flying head of the present invention, to which the flying head of FIG. 1 is mounted.

First, the configuration of a flying head 1 according to the present invention will be described with reference to FIG. The flying head 1 includes a head slider 2, a magnetic head 3, a pair of leaf springs 4, 5, and a mounting substrate 6. The head slider 2 has two leading edges A
It has BS surfaces 7a, 7b and two trailing edge ABS surfaces 8a, 8b. Similarly, on the back side of these ABS surfaces, the AB
Convex portions 9a, 9b, 10a and 10b having the same size and shape as the S surface are formed. 11 and 12 are slider grooves. These slider grooves 11, 12 are also symmetrical. The reason why the head slider 2 is formed to have a symmetrical shape on both sides is to improve the yield of the head slider 2 by using the surface on the ABS side when one of the surfaces is more excellent. This is because it was considered so that it could be measured. The material of the head slider 2 is Altic (Al ₂
O ₃ —TiC) was used. Its dimensions are about 3mm wide,
The length is about 4 mm and the thickness is about 1.2 mm.
The depths of 1 and 12 are the leading and trailing edge ABS surfaces 7a, 7b, 8
a, 8b and projections 9a, 9b, 10a, 10b to 15
It was set to 0 μm.

In the center of the front edge ABS surfaces 7a, 7b and the rear edge ABS surfaces 8a, 8b, a head insertion groove cut from the middle of the edge of the rear edge ABS surfaces 8a, 8b is formed. The magnetic head 3 is fixed to the head slider 2 by glass fusion. Reference numerals 22a and 22b denote glass in which the head insertion grooves are fused and embedded. The amount of protrusion of the magnetic head 3 is the same or several μm from the ABS surface as a reference surface. The magnetic head 3 is wound so that its lead wire 14 is taken out from the head winding groove 13.

The leaf springs 4 and 5 have the same shape, the width on the side of the mounting substrate 6 is relatively wide, and the width on the side where the head slider 2 is mounted is relatively narrow and tapered. These two leaf springs 4 and 5 are connected to the head slider 2
To the mounting substrate 6. First, the leaf spring 5 is bonded and fixed to the bonding groove 21 of the slider groove 12 of the head slider 2 and the bonding groove 16 of the mounting substrate 6. Similarly, the leaf spring 4 is bonded and fixed to the bonding groove 20 of the slider groove 11 of the head slider 2 and the bonding groove 15 of the mounting substrate 6. In this case, the interval between the leaf spring 4 and the leaf spring 5 is set to be parallel over the entire length. 17 is an actuator arm of FDD (FIG. 2)
Reference numeral 18 denotes a reference surface to be attached to the actuator arm. The plate springs 4 and 5 used stainless steel having a plate thickness of 40 μm.

Next, the configuration of the FDD 40 will be described with reference to FIG. The FDD 40 is shown as a device for recording an information signal on one side of the FD. Numeral 30 denotes this FD, which is obtained by depositing a magnetic material such as Co-Cr or value ferrite on the surface of a PET film having a thickness of 41 μm by sputtering, vapor deposition or the like. Its diameter is 50-65m
m. In this figure, the FD rotating device is omitted.
The structure in which the flying head 1 is mounted on the FDD 40 will be described. Actuator arm 50 is lower arm 5
1 and an upper arm 52. The lower arm 51 is provided with a mounting pin 53 for mounting the flying head 1, a reference height interval pin 54 for setting a reference height with respect to the upper arm 52, and a bearing housing 55. ing. Upper arm 5
The rotating shaft 56 fixed to 2 is rotatably supported by a bearing of a bearing housing 55 and can rotate up and down around the axis of the rotating shaft 56. Therefore, first, the lower arm 51
When the mounting hole 17 is pressed into the mounting pin 53 press-fitted with the reference surface 18 of the mounting board 6 of the flying head 1 facing down, the reference surface 57 of the lower arm 51 and the reference surface 1 of the mounting board 6 are pressed.
8 and the height position is determined. Similarly, when the mounting hole 17 of the flying pad 1a (the configuration is the same as that of the flying head 1 except that the magnetic head 3 is not mounted) is pressed into the mounting pin 58 pressed into the upper arm 52, the upper arm The reference surface 59 of 52 and the reference surface 18 of the mounting board 6 are in contact, and the height position is determined. Thus, the flying head 1 and the flying pad 1a are attached to the lower arm 51 and the upper arm 52, respectively.
The rotation shaft 56 of the upper arm 52 is supported by the bearing of the bearing housing 55, and the upper arm 52 is rotatable about the axis of the rotation shaft 56. In this case, the distance between the upper and lower arms is the reference surface 6 of the reference height interval pin 54 press-fitted into the lower arm 51.
It is determined by 0. Reference numeral 61 denotes a rotating shaft 61 of the actuator arm 50. The lower arm 51 is driven by a voice coil motor on the opposite side of the lower arm 51 to the rotating shaft 61. 1 seeks from the inner circumference to the outer circumference on the FD 30 surface by an arbitrary angle. It should be noted that the voice coil motor also does not show a plunger mechanism for rotating the upper arm 52 and the flying pad 1a up and down or the like because it is not the gist of the present invention and does not show it.

Next, the operation of the FDD 40 having such a configuration will be described. First, the flying pad 1a is raised in the direction of the arrow Y to be in an unloading state, the FD 30 is mounted on an FD cradle (not shown) of the spindle motor, and after mounting, the flying pad 1a is rotated and loaded.
The FD 30 is sandwiched between the pair of head sliders 2 and 2a, and the FD 30 is rotated in the arrow X direction. In FIG. 2, the lower surface of the FD 30 is the recording medium surface. Magnetic head 3
1B are the leading edge ABS surfaces 7a and 7b and the trailing edge ABS surface 8 of FIG. 1B.
2A and 2B, the FD 30 projects from the plane of the magnetic head 3 as shown in FIG.
D It is familiar with the shape of the contact surface. Further, since both the flying head 1 and the flying pad 1a support the head sliders 2 and 2a by the parallel leaf springs 4, 5, the head slider 2 does not roll unlike the related art, and the head slider 2 and 2a do not roll. 2a can be stably levitated from the FD 30 surface. Further, since the FD 30 is sandwiched between the front edge ABS surfaces 7a and 7b and the rear edge ABS surfaces 8a and 8b of both the head sliders 2 and 2a, the FD 3 sandwiched between the ABS surfaces is formed.
The recording medium surface of 0 is in a very stable state. On the other hand, since the magnetic head 3 is arranged at the center of the ABS surfaces 7a, 7b, 8a, 8b, the magnetic head 3 can stably contact the recording medium surface in the stable area. Was. In this case, since the force of the magnetic head 3 hitting the recording medium surface of the FD 30 was as low as 0.5 gr or less, both the head life and the FD life could be extended.

In FIG. 2, the FD 30 is moved in the direction of arrow X.
For example, 3,600 r. p. m. If the gaps 70 and 71 between one of the leaf springs 4 of the flying head 1 and the flying pad 1a and the FD 30 are far apart, the fluid force induced by the FD 30 causes
Although the FD 30 causes a large surface runout, the distances 70 and 71 between the parallel leaf spring 4 and the FD 30 are 1
When the interval is as small as about 00 μm, that is, when the leaf spring 4 is arranged in the fluid boundary layer induced by the FD 30, the plane (trapezoidal surface) of the leaf spring of the parallel leaf spring 4 stabilizes the above-mentioned disturbed fluid force. It also has the function of smoothing the fluid force. Therefore, the FD 30
And the vibration of the leaf spring 4 is also removed, so that the contact between the magnetic head 3 and the recording medium surface of the FD 30 becomes more and more optimal.

[0013]

As is apparent from the above description, the information signal recording / reproducing apparatus using the flying head of the present invention has the following features.
Because the flying head is configured to have a cantilevered head slider fixed to one end of a pair of parallel leaf springs,
Rolling does not occur in the head slider, so that the FD is not damaged by the edge of the ABS surface of the head slider, and the contact between the magnetic head and the FD becomes good, so that there is no spacing loss, and therefore, ultra-high density recording is possible. Will be possible. Furthermore, since the plate spring performs the function of the fluid stabilizer, there is an effect that surface runout of the FD can be eliminated. Further, a flying head in which a magnetic head mounted at a substantially central portion between a plurality of ABS surfaces provided in a state in which the head slider is in contact with the FD and separated from each other is arranged in a stable area of a magnetic recording surface. Using,
Since the magnetic recording or reproduction is performed, the magnetic head comes into stable contact with the recording medium in the stable area, thereby weakening the force of the magnetic head against the FD surface of the recording medium. Thus, the life of the head is improved.

[Brief description of the drawings]

[1] an explanatory drawing for explaining the structure of a flying head which is an embodiment of the present invention, FIG. A is a plan view, and Figure B is a cross-sectional side view of X ₁ over X ₂ line of FIG. 1A, FIG. C is a bottom view and FIG. D is a front view.

FIG. 2 is a cross-sectional view of a main part of an information signal recording / reproducing apparatus using the flying head of the present invention equipped with the flying head of FIG.

FIG. 3 is a perspective view of a flying head used in a conventional information signal recording / reproducing apparatus.

[Explanation of symbols]

Reference Signs List 1 flying head 2 head slider 2a head slider 3 magnetic head 4 leaf spring 5 leaf spring 6 mounting board 7a front edge ABS surface 7b front edge ABS surface 8a rear edge ABS surface 8b rear edge ABS surface 9a front edge protrusion 9b front edge protrusion Part 10a Trailing edge projection 10b Trailing edge projection 11 Slider groove 12 Slider groove 17 Mounting hole 30 Flexible rotating disk (FD) 40 Information signal recording / reproducing device (FDD) using flying head 50 Actuator arm 51 Lower arm 52 Upper arm 53 Mounting pin 54 Reference height interval pin 55 Bearing housing 56 Rotating shaft 58 Mounting pin 61 Rotating shaft 70 Gap 71 Gap

Claims (1)

(57) [Claims] A pair of head slides supported by a pair of parallel leaf springs for stabilizing a magnetic recording surface with both surfaces of a flexible rotary magnetic disk sandwiched therebetween, and at least one of the pair of head sliders; A magnetic head is mounted at a substantially central portion between a plurality of air bearing slider surfaces provided separately from each other on a surface in contact with the rotating magnetic disk, and an information signal is transmitted within a stable area of the magnetic recording surface. An information signal recording / reproducing apparatus using a flying head, which magnetically records or reproduces the information.